Ritchie, A.H. 1928 Control of plant pests and diseases.. Annual report (Tanganyika Department of Agriculture) for year ending March 31, 1928 34-40.

Notes: Coffee pests include Aspidiotus lataniae, Asterolecanium coffeae, Ceroplastes vinsonioides, Chionaspis ritchiei, Coccus caudatus, Ctenochiton, arborescens, Ferrisia vergatus, Icerya aegyptiaca, Ichnaspis (Ischnaspis?) longirostris, Lecanium sp. nov.?, Pseudaonidia psidii, Pseudococcus brevipes, P. bukobensis, P. filamentosus, P. lilacinus, P. perniciosus and Selanaspidus articulatus. Cotton pests include Ferrisia virgatus, Phenacoccus iceryoides and Pulvinaria jacksoni.